I am a home owner and have a husquavarna 48" with a 24hp twin briggs and stratton engine. I am having trouble losing power after about 15 minutes of running the mower. This weekend I changed the fuel filter, oil and filter, air filter, and the spark plugs. The problem is still occuring. After I got everything changed, I started it up and let it run for about 20 minutes. The fuel filter filled up 3/4 full right off the bat, but after running 10 minutes or so, it was back to trickles of gas entering the fuel filter. I believe that I have something blocking the fuel line from the fuel tank itself. I was planning on changing the diaphram or regulator (the little black box that a tube leads into from the fuel filter) before I pull the fuel tank off or have someone tear apart my carborator. And suggestions? I need to have my mower running withing two weeks. THE GRASS IS GREEN!!!!